Walchem W600 Series, Instruction Manual, Page: 5 / 88

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1.0 INTRODUCTION
The Walchem W600 Series controllers offer a high level of flexibility in controlling water treatment
applications.
One or two sensor inputs are available that are compatible with a variety of sensors:
Contacting conductivity
Electrodeless conductivity
pH
ORP
Any Walchem disinfection sensor
An analog (4-20 mA) sensor input card with two input circuits is also available for use with 2, 3 or 4-
wire transmitters.
Six relay outputs may be set to a variety of control modes:
On/Off set point control
Time Proportional control
Pulse Proportional Control (requires pulse output relay option)
Dual set point
Timer
Bleed or Feed based on a Water Contactor or Paddlewheel flow meter input
Cycles of Concentration
Feed and Bleed
Feed and Bleed with Lockout
Feed as a percent of Bleed
Feed as a percent of elapsed time
Daily, Weekly, 2-week or 4-week Biocide timers with pre-bleed and post-add lockout of
bleed
Intermittent sampling for boilers with proportional blowdown, controlling on a trapped
sample
Always on unless interlocked
Diagnostic Alarm triggered by:
High or Low sensor reading
No Flow
Relay output timeout
Sensor error
An option card with two isolated analog outputs may be installed to retransmit sensor input signals to
a chart recorder, datalogger, PLC or other device. They may also be connected to valves, actuators or
metering pumps for linear proportional control.
An Ethernet option provides remote access to the controller’s programming via a PC connected
directly, via a local area network, or via Walchem’s VTouch account management server.
Our USB features provide the ability to upgrade the software in the controller to the latest version.
The Config file feature allows you to save all the set points from a controller onto a USB flash disk,
and then import them into another controller, making the programming of multiple controllers fast
and easy. The data logging feature allows you to save the sensor readings and relay activation events
to a USB flash disk.